/Engine/Source/Runtime/GeometryCore/Public/TriangleTypes.h
a C array of vertex orderings for each of the 4 triangle faces of a tetrahedron
namespace UE { namespace Geometry { namespace TetUtil { template<bool bReverseOrientation> const [FIndex3i](API\Runtime\GeometryCore\FIndex3i) * UE::Geometry::TetUtil::GetTetFaceOrdering() } } }